SHAFT AS 1471226 - Caterpillar

Swing Brake Solenoid
The swing brake solenoid is an output of the Machine ECM. The swing brake solenoid is energized in order to release the swing brake. When the swing brake is released, the upper structure is free to rotate. The swing brake is released when the control levers are actuated. The swing brake solenoid is de-energized approximately 6.5 seconds after any lever is moved to NEUTRAL position.Travel Speed Solenoid
The travel speed solenoid is an output of the Machine ECM. When the travel speed solenoid is active, the machine can travel at high speed. The travel speed solenoid is active when the travel speed mode switch is set to "RABBIT (high)" mode. The travel speed also depends on the delivery pressure of the main pump. If the delivery pressure of the main pump is high, the travel speed solenoid is de-energized. When the delivery pressure of the main pump is low, the travel speed solenoid is energized.Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.This solenoid is activated while the key switch is in the ON position and the hydraulic lock lever is in the UNLOCK position.Boom Side Warm-up Solenoid and Stick Side Warm-up Solenoid
Warm-up solenoids are part of the automatic hydraulic warm-up feature and can only be activated with the hydraulic activation lever is in the LOCKED position. The temperature of the hydraulic fluid is monitored by the Machine ECM. If the Machine ECM determines the hydraulic fluid is below the desired temperature, the warm-up solenoids will be energized. The solenoids direct the flow of oil in each of the circuits through an orifice. The increased pressure created by the orifice causes the hydraulic oil to warm up. The oil is passed through the system and returned to the hydraulic tank until the desired temperature is reached.The hydraulic warmup function can be ENABLED or DISABLED in the monitor.Stick Drift Reduction Valve Solenoid and Boom Drift Reduction Valve Solenoid
When the joysticks are in the NEUTRAL position, the drift reduction valves stop oil leakage. During a BOOM LOWER operation or a STICK IN operation, the machine ECM will energize the solenoid. This action drains the pressure off the back side of the drift reduction valve and the boom and/or stick is allowed to move.For the boom circuit, the drift reduction valve stops oil leakage for the head end of the cylinder. For the stick circuit, the drift reduction valve stops oil leakage for the rod end of the cylinder.Reverse Fan Solenoid
The reverse fan solenoid can be activated by the operator through the monitor. The reverse fan solenoid is energized by the engine ECM. Pilot oil can now flow to the hydraulic reversing valve which changes the direction of oil flow to the fan motors. The cooling fans now turn in the opposite direction which is useful for cleaning